Advertisements TGC answered your question on moving to HD pretty thoroughly. In regards to his speaking of S2 models - TiVo has legacy to deal with. Streaming is the way to go forward but TiVo S2 records only analog and S3 can record analog signals as well. Being able to stream that older analog stuff is likely a big PITA and requires more processor power than an S2 has. Likely the S3 would have issues streaming recordings from analog cable as well. The new S4 is likely the first box that can really handle streaming - so TiVo could put out a mate for them but that leaves S3 and S2 users possibly in the dust. TiVo legacy issues on analog cause them a lot of issues other DVR makers do not have to face. Moxi basically records only Digital out of the box and you have to ask for a USB Analog tuner if you want to record analog. DirecTV owns the whole signal and DVR box so they have always just recorded digital only.